Description
Introduction
Schischek RedMax-50.75-S | explosion-proof ¼-turn actuator, Open-close / 3-position, 50/75 Nm. First and foremost, this actuator delivers 50/75 Nm torque and a universal 24…240 V AC/DC supply. In addition, you can flexibly choose Open-close / 3-position control, allowing you to easily use existing control systems. This increases operational reliability while the compact housing saves installation space.
Key features
- Explosion-proof actuator for zone 2/22, designed for HVAC and process rooms.
- Universal 24…240 V AC/DC supply; easy to integrate into existing systems.
- High torque in a compact form factor; saves installation space.
- 95° travel with ~5° pre-position for reliable valve or damper actuation.
- Brushless motor and 100% overload protection; long service life.
Technical specifications
| Series / size | RedMax, size M |
| Torque | 50/75 Nm |
| Supply voltage | 24…240 V AC/DC (self-adjusting) |
| Control | Open-close / 3-position |
| Feedback | 2 auxiliary switches |
| Spring return (fail‑safe) | No |
| Rotation angle | 95° incl. ~5° pre-position |
| Protection rating | IP67 (size M) |
| Explosion-proof | ATEX zone 2/22 |
| Operating environment | −40…+40 °C (T6) / −40…+50 °C (T5) |
| Housing | Coated aluminium (option: stainless steel or seawater-resistant) |
| Shaft connection | Double square 16 × 16 mm (size M) |
| Manual operation | Included (hexagon) |
| Heating | Integrated heating down to −40 °C |
| Auxiliary switches | 2 auxiliary switches |
| Ex safety circuit | No |
| Weight | ~9,5 kg (aluminium) |
Available variants
| Article name | Description | SKU |
| RedMax-50.75 | Electric, explosion-proof ¼-turn actuator, Open-close/3-position, 24…240 V AC/DC, 95° | RedMax-50.75 |
| RedMax-100 | Electric, explosion-proof ¼-turn actuator, Open-close/3-position, 24…240 V AC/DC, 95° | RedMax-100 |
| RedMax-150 | Electric, explosion-proof ¼-turn actuator, Open-close/3-position, 24…240 V AC/DC, 95° | RedMax-150 |
| RedMax-50.75-S | Electric, explosion-proof ¼-turn actuator, Open-close/3-position with 2 auxiliary switches, 24…240 V AC/DC, 95° | RedMax-50.75-S |
| RedMax-100-S | Electric, explosion-proof ¼-turn actuator, Open-close/3-position with 2 auxiliary switches, 24…240 V AC/DC, 95° | RedMax-100-S |
| RedMax-150-S | Electric, explosion-proof ¼-turn actuator, Open-close/3-position with 2 auxiliary switches, 24…240 V AC/DC, 95° | RedMax-150-S |
| RedMax-30-F | Electric, explosion-proof ¼-turn actuator, Open-close/3-position with spring return (~20 s), 24…240 V AC/DC, 95° | RedMax-30-F |
| RedMax-50-F | Electric, explosion-proof ¼-turn actuator, Open-close/3-position with spring return (~20 s), 24…240 V AC/DC, 95° | RedMax-50-F |
| RedMax-60-F | Electric, explosion-proof ¼-turn actuator, Open-close/3-position with spring return (~20 s), 24…240 V AC/DC, 95° | RedMax-60-F |
| RedMax-30-SF | Electric, explosion-proof ¼-turn actuator, Open-close/3-position with spring return (~20 s), 24…240 V AC/DC, 95° | RedMax-30-SF |
| RedMax-50-SF | Electric, explosion-proof ¼-turn actuator, Open-close/3-position with spring return (~20 s), 24…240 V AC/DC, 95° | RedMax-50-SF |
| RedMax-60-SF | Electric, explosion-proof ¼-turn actuator, Open-close/3-position with spring return (~20 s), 24…240 V AC/DC, 95° | RedMax-60-SF |
Application and installation
For example on butterfly valves, ball valves and safety valves. Because the actuator has a double square drive, you couple directly to the shaft. Manual operation is also provided for service. Note: in Ex-zones always use an Ex junction box and comply with local standards.
FAQ
Is this actuator suitable for my application?
Yes, compared to alternatives the RedMax-50.75-S covers both valves and dampers thanks to its 95° travel and the specified torque.
How fast does the spring return respond?
Not applicable
What feedback do I get?
2 auxiliary switches.
Do I need an Ex junction box?
Yes, unlike safe zones, in zone 2/22 you must use an Ex junction box (for example RedBox) for wiring.
Have questions or want more information? Contact contact us! You can reach us by phone, email, or, if you prefer, via the chat function.
Available actuators in the RedMax-M series | 30-150 Nm
RedMax-M | without spring return | 50…150 Nm | zone 2, 22
| Type | Torque | Spring return | Control | Technical data | Extra info | Certificate | EU conformity |
| RedMax-50.75 | 50/75 Nm | – | Open-close, 3-point or modulating |  | | | |
| RedMax-100 | 100 Nm | – | Open-close, 3-point or modulating | | | | |
| RedMax-150 | 150 Nm | – | Open-close, 3-point or modulating | | | | |
| RedMax-50.75-S | 50/75 Nm | – | Open-close, 3-point or modulating | | | | |
| RedMax-100-S | 100 Nm | – | Open-close, 3-point or modulating | | | | |
| RedMax-150-S | 150 Nm | – | Open-close, 3-point or modulating | | | | |
| RedMax-50.75-Y | 50/75 Nm | – | 0-10 V, 4-20 mA | | | | |
| RedMax-100-Y | 100 Nm | – | 0-10 V, 4-20 mA | | | | |
RedMax-M | with spring return | 30…60 Nm | zone 2, 22
| Type | Torque | Spring return | Control | Technical data | Extra info | Certificate | EU conformity |
| RedMax-30-F | 30 Nm | approx. 20 sec. / 90° | Open-close, 3-point or modulating | | | | |
| RedMax-50-F | 50 Nm | approx. 20 sec. / 90° | Open-close, 3-point or modulating | | | | |
| RedMax-60-F | 60 Nm | approx. 20 sec. / 90° | Open-close, 3-point or modulating | | | | |
| RedMax-30-SF | 30 Nm | approx. 20 sec. / 90° | Open-close, 3-point or modulating | | | | |
| RedMax-50-SF | 50 Nm | approx. 20 sec. / 90° | Open-close, 3-point or modulating | | | | |
| RedMax-60-SF | 60 Nm | approx. 20 sec. / 90° | Open-close, 3-point or modulating | | | | |
| RedMax-30-YF | 30 Nm | approx. 20 sec. / 90° | 0-10 V, 4-20 mA | | | | |
| RedMax-50-YF | 50 Nm | approx. 20 sec. / 90° | 0-10 V, 4-20 mA | | | | |
| RedMax-30-BF | 30 Nm | approx. 20 sec. / 90° | Open-close, 3-point or modulating | | | | |
| RedMax-50-BF | 50 Nm | approx. 20 sec. / 90° | Open-close, 3-point or modulating | | | | |
| RedMax-60-BF | 60 Nm | approx. 20 sec. / 90° | Open-close, 3-point or modulating | | | | |
| RedMax-30-F3 | 30 Nm | < 3 sec. / 90° | Open-close | | | | |
| RedMax-50-F3 | 50 Nm | < 3 sec. / 90° | Open-close | | | | |
| RedMax-30-SF3 | 30 Nm | < 3 sec. / 90° | Open-close | | | | |
| RedMax-50-SF3 | 50 Nm | < 3 sec. / 90° | Open-close | | | | |
| RedMax-30-BF3 | 30 Nm | < 3 sec. / 90° | Open-close | | | | |
| RedMax-50-BF3 | 50 Nm | < 3 sec. / 90° | Open-close | | | | |